<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		
		<input type="text" name="text" id="text" value="" />
		<button onclick="send()"> send</button>
		<button onclick="closeWebSocket()"> close</button>.
		<button onclick="test1()"> test1</button>
		<div id="message"></div>
		
		
	<script type="text/javascript">

    var websocket = null;
    var state = false;

    //判断当前浏览器是否支持WebSocket
    if('WebSocket' in window){
        websocket = new WebSocket("ws://192.168.1.121:8181/ws?id=id123kjk234k21341k");
    }
    else{
        alert('Not support websocket')
    }

    //连接发生错误的回调方法
    websocket.onerror = function(){
        setMessageInnerHTML("error");
    };

    //连接成功建立的回调方法
    websocket.onopen = function(event){
        setMessageInnerHTML("open");
//        send("{\"id\":\"2\",\"sign\":\"2\",\"action\":\"login\"}");
        state = true;
    }

    //接收到消息的回调方法
    websocket.onmessage = function(event){
        console.log(event)

        setMessageInnerHTML(event.data);
    }

    //连接关闭的回调方法
    websocket.onclose = function(){
        setMessageInnerHTML("close");
        state = false;
    }

    //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
    window.onbeforeunload = function(){
//        send("{\"id\":\"2\",\"sign\":\"2\",\"action\":\"close\"}");
        state = false;
        websocket.close();
    }

    //将消息显示在网页上
    function setMessageInnerHTML(innerHTML){
        document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }

    //关闭连接
    function closeWebSocket(){
//        send("{\"id\":\"2\",\"sign\":\"2\",\"action\":\"close\"}");
        state = false;
        websocket.close();
    }

    //发送消息
    function send(){
        var message = document.getElementById('text').value;
        send(message);
    }

    function send(message){
        websocket.send(message);
    }

    //发送消息
    function test1(){
        console.log(websocket);
        console.log(state);
        if(!state){
            websocket = new WebSocket("ws://127.0.0.1:8181/ws?id=1");
            websocket.onopen = function(event){
                setMessageInnerHTML("open");
//                send("{\"id\":\"2\",\"sign\":\"2\",\"action\":\"login\"}");
                state = true;
            }
        }
    }
		</script>
	</body>
</html>
